Ventilation air follows exactly the opposite path.
Roof sheathing ridge gap.
Purlins at a 45 degree angle still provide sufficient support for installation of the metal roof panels.
Like you i usually see about 1 1 2 inches of gap for the ridge vent.
It takes 36 nine 4 panels 8 gaps of wall before the panel creep has moved a full inch which is probably the absolute limit.
Ridge vents when the roof sheathing is used as a structural diaphragm as it typically is in high wind and seismic hazard areas the structural integrity of the diaphragm can be compromised by a continuous vent see figure a below left.
I am a diy so could easily be wrong but the 1in strip at the top near the ridge doesn t seem like good practice to me.
The house does not have an overhang.
It is important here that the sheathing at the eave line be exactly perpendicular to the rafters so that the sheets will meet at the centers of the rafters.
Now wait a minute.
How should the sheathing meet at the roof peak when there will be no ridge vent.
It s a simple gable roof with vents at either end and a ridge vent.
The ridge vent installed properly will work better than retrofitted roof vents.
If there were signs of trouble i d tell them to cut it out properly.
Leave a slight gap as if the sheathing was cut a little short and install the sheathing to a matching edge no gap.
But where the wall sheathing meets the roof sheathing there is a gap of approximately 1 8 of an inch.
The gap size typically between 1 and 3 inches.
When using full sheets of sheathing i end up with a 2 2 5 inch gap from center on either side of the ridge beam.
This is a simple pitched roof line with ridge beam and rafters attached with slope hangers.
Begin applying the sheets from the bottom of the roof the eaves and work your way up to the ridge.
Ridge vent installation in new construction the roofing contractor leaves a small gap at the peak of the roof when installing the roof sheathing.
The last course at the top may need to be rip cut if the roof is not in 4 foot increments.
So you re talking about you re going to reroof and you have a gap between the wall sheathing and the roof sheathing.
I have seen two thoughts.
The original builders had put a 1 inch strip of plywood to reduce the gap opening.
And i was advised that that gap should be protected by a home inspector.
Jim katen oregon.
If there were no signs of trouble due to the abnormally small cut out i d just note its presence.
